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Vulnerability of Linux kernel: use after free via ext4_xattr_set_entry

Synthesis of the vulnerability

An attacker can force the usage of a freed memory area via ext4_xattr_set_entry() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Severity of this announce: 2/4.
Creation date: 28/11/2019.
Références of this computer vulnerability: CVE-2019-19319, VIGILANCE-VUL-31021.

Description of the vulnerability

An attacker can force the usage of a freed memory area via ext4_xattr_set_entry(...
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This computer vulnerability bulletin impacts software or systems such as Linux.

Our Vigil@nce team determined that the severity of this vulnerability bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this threat note.

Solutions for this threat

This vulnerability patch will be public soon.
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